Tuyere structure for single-retort stokers



June 30; 1925.

R. L. BEER S TUYERE STRUCTURE FOR SINGLE REIORT STOKERS Original Filed Jan. 14, 1921 Patented June 30,1925.

I UNITED STATES ROYCE L. BEERS, OF DETROIT, MIoHIGAm AssIGNoR To THE UNDEREEED STOKEB COMPANY or AMERICA, 01 DETROIT, MICHIGAN, A CORPORATION OF NEW JERSEY.

TUYERE STRUCTURE FOR SINGLE-RETOBT STOKEBS.

Original application filed January 14, 1921, Serial No. 487,238. Dividedand 11, 1923. Serial No. 6 56,978.

To ail whom it may concern: 3

Be it known that I, RoYoE L. BEERS, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Tuyere Structures for Single-Retort Stokers, of which the following is a specification.

My inventionrelates to a tuyere structure forunderfeed stokers and, in some of its features, more particularly to a tuyere structure which may be used in Original construction or in repair of the well-known The tuyere structures ordinarily used in- Jones Standard stokers are usually made in block form, formed of hollow casting, each adapted singly to be seated in an elongated aperture formed in the furnace floor contiguous to the margins of a retort.

Such usual tuyere structure is, of necessity,-

often subjected to fierce heat and therefore is liable to burning out of its surfaces that are exposed to'the fuel. With the ordinary form of tuyere block such burning out is one or more thereof does not result in any substantial dropping of the fire, but limits the injurious consequences to the more need for replacement of the damaged tuyere element or elements at leisure. Further features of my invention provide for the presentation of a maximum cooling surface tothe air-flow passage below the tuyere plates and, for each plate or element, minimized-- this application filed has heat-withstanding surfaces exposed to direct contact with the burning fuel, so as to enable the plate elements to withstand the severe conditions of their use inhnderfeed stokers. And further my improved plate tuyere structures hereinafter claimed are so constructed and arranged that they may be 'used in lieu of, or asrepair parts to re-' place, the ordinary block tuyere structures of the Jones underfe'ed stoker, without requiring change in the arrangement of tuyere receptive openingsbordering the retorts,

In the drawings wherein I have shown an embodiment'of my invention, Fig. 1 is a plan View with parts broken away, of the marginal portion of a retort and tuyere blocks associated therewith, suitable for Jones Standard stokers; Fig. 2 is a front ,elevation of the tuyereparts shown in Fig. 1, with the retort margin and some of the tuyere plates broken away; Fig. 3 is a section on line 3--3 of Fig. 2, and Fig. 4 is a perspective detail of a tuyere plate detached.

In the Jones Standard stoker the retort 11 (only fragmentarily illustrated) has a broad rim 12 constituting a substantially horizontal portion of the fire-box floor, and

this rim is provided with a series of openings 13 separated from the margins of the retort by the narrow border 14 and separated from each other by'narrow strengthening bars 15.' Each aperture 13 is preferably oblong, and of greatest dimension in a direction parallel with the retort, and for each such opening I employ a plurality of individual tuyere plates 16, sayfour thereof, in lieu of a single hollow tuye're block. Each of these tuyere plates 16 is a casting comprising the vertical body web 17, a marginalflange 1.8 extending equally on both sides of the body web along its top and down its rear side margins, a front flange structure 19 interrupted by tuyeres or apertures 20 that are formed as faced-opening notches in the flanges, and an attachment base 21,

wvliich forms a fiangeless extension of the body web 17 and is apertured as at 22 for the reception of the longitudinal tie-rod 23. As shown in Fig. 3, the outline of the tuyere plate, viewed from its face,.may be- I the conventional outline of the ordinary tuyere block, and the tuyere-interrupted flange 19 may take the form of properly Spaced shallow ribs 19 extending to diftially at right angles to ,the axial line of the retort. These tuyere plates are placed in position and anchored by the tie-rods in the fashion shown, and it will be apparent that should the flanges 18 and 19 of the plate burn off, leaving mutilated tuyeres burned down (even to the extent of the plates shown insection in the center of Fig. 1) there still is left a substantial grill of fire-supporting web-structure which will prevent the falling through of the fire to any seriously detrimental extent. Furthermore it will be apparent that in effecting repairs, only a minimum number of new parts need be supplied to restore the precise area that has been fire-damaged.

Also it will be observed that since theribs 19 intervening between the tuyere openings are arranged on the Side. faces of the web 17., so that coring is simple in making the casting, these ribs may be made quite long, to withstand a considerable burning away of the edge of the tuyere which faces toward the retort without enlarging the 'tuyereopenin and further that each of the body webs 1 inte ally united with the exposed surfaces of the plates, and extending clear down through the receptive orifice 13, acts as a heat conductive element, carrying heat away from the fuel-receptive surfaces of the tuyere, and itself kept cool by constant flow of air through thespaces intervening between adjoining Webs. This tends not only to keep the exposed surfaces of the tuyere structure from melting, but by keeping the exposed surfaces quite cool the adhesion of clinkers and slag is minimized, and consequently the chances of clogging the tuyere openings are minimized, so that said openings may be made quite small individually, without disadvantage. Such factors are of substantial importance because, as will be appreciated. the fuel. contiguous to the tuyere openings, in underfeed stoker operation, is not only in very active combustion I claim 1. A plate-tuyere element for underfeed stokers comprising in a unitary structure a single, narrow, central body-web of substantially uniform thickness having a wide top portion 17 which affords front, top and rear edges for exposure to the fuel and having a reduced base portion 21 extending below said top portion, all margins of saidbase portion beingofthe thinness of the bod web; shallow marginal flanges on opposite sides of said upper portion extending uninterruptedly along the top and down the rear thereof; and ribs 19' formed on the sides of said body weband extending substantially horizontall from the front edge of the body rearwar ly across the forward portion of the body, these ribs being sep arated to vleave therebetween the tuyere openings 20, and on opposite sides of the body web being identically placed and of the same shallo'wness as the marginal flanges,

substantially as and' for the purposes described.

2. The combination with a portion of a fire-box floor'providing a retort wall 11 and a retort-bordering rim 12 having oblong openings 13 therethrough, of a plurality of plate tuyere elements mounted in each said opening, and jointly filling the same, each said plate tuyere element comprising a body web having a base portion shapedto fit within the front and rear edges of the opening and having an upper portion above the base portion, each ,suchplate having along its ,top and rear mar ins jshallow lateral flange projections of un form extent, and on its side surfaces having ribs of the same depth as said flanges extending substantially parallel to the retort bordering rim and terminating at the front of said body, said flanges leaving therebetween narrow openings, substantially as and for the-purposes described. .v

- ROYCE L. BEERS. 

